Mental Math Skills Quiz: Adding three-digit numbers without a calculator
Free online printable quiz with multiple-choice questions (MCQ) without registration.
By solving examples with simple arithmetic operations, such as addition and subtraction, we actively and effectively train our brains. This helps it stay in shape, which means we keep a clear mind for years to come.
The mental math skills quiz "Adding three-digit numbers without a calculator" consists of 20 questions of varying difficulty. Try them all in 7-10 minutes. If it takes you less than 5 minutes, you're in great shape!
Right answers
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1. 901 + 365 = ...
1266
2. 221 + 342 = ...
563
3. 555 + 555 + 555 =
1665
4. 666 + 999 = ...
1665
5. 384 + 121 + 501 = ...
1006
6. 438 + 321 + 101 = ...
860
7. 106 + 111 + 121 = ...
338
8. 135 + 185 = ...
320
9. 222 + 444 + 666 = ...
1332
10. 323 + 181 = ...
504
11. 577 + 342 = ...
919
12. 321 + 432 + 543 = ...
1296
13. 834 + 563 = ...
1397
14. 181 + 389 = ...
570
15. 561 + 322 = ...
883
16. 381 + 183 = ...
564
17. 101 + 100 + 111 = ...
312
18. 412 + 320 + 201 = ...
933
19. 123 + 456 + 789 = ...
1368
20. 432 + 578 + 235 = ...
1245